NAIROBI&#65292; Sept. 28 (Xinhua) -- Kenyan police said on Wednesday they have stepped up surveillance on suspected Al-Shabaab activities across the border and their attempts to infiltrate the country to mount terror attacks.

Inspector General of Police Joseph Boinett said security officers have witnessed and repulsed sporadic attempted terror attacks in the past month in areas such as Mandera and Wajir counties in northeast Kenya bordering Somalia.